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(No Model.) 2 Sheets-Sheet l.

J. W. POST.

SEWING MACHINE.

No. 292,045. Patented Jan. 15, 1884.

v (No Model.) 2 Sheets--Sheet 2.

J. W. POST. SEWING MACHINE.

No. 292,045. Patented Jan.'15; 1884.

' UNITED STATES JOHN lV. POST, OF NEV YORK, N. Y.

SEWING-MACHINE.

srncrrroa'rron forming part of Letters Patent No. 292,045, dated January 15, 1884,

Application filed November 16, 1883. (No model.)

To all whom, it may concern.-

Be it known that I, JOHN POST, a citizen of the United States, residing at New York,

in the county of New York and State of New easily attachable to and removable from the machine in making the change from one form of stitch to another.

In the drawings, Figure 1 is a sectional side elevation of a machine embodying my invention. Fig. 2 is a front view of the same with the lock-stitch mechanism in position. Fig. 3 is a detail view of the bobbin-supporter and adjacent parts. Fig. dis a partial front view, showing the chain-stitch mechanism. Fig. 5 is a detail view, showing means for removably securing the lock-stitch-looper pin to the crankdisk. Fig. 6 is a detail view of a modifica tion, and Fig. 7 shows the connecting mechanism for the two shafts of the machine.

A is the bed-plate of the machine, sustaining the bracket-arm B, and O is the main or driving shaft journaled in lugs or brackets depending from the bed-plate. To the main shaft is secured an eccentric, a, connected by a pitman, D, to the rear arm 6 of a rock-shaft, E, j ournaled in the horizontal portion of the bracket-arm. An arm, 6, on the forward end of the shaft E, is connected by a link, f, with a collar, f, secured to the needle-bar F.

From the foregoing it will be apparent that the main shaft, when rotated, will impart a vertical reciprocating movement to the needlebar through the mechanism just described.

Excepting the needle-operating mechanism above referred to and the details hereinafter indicated, the lock and chain stitch mechanisms of the present machine are essentially the same in their construction and operation as in the patent hereinbefore mentioned, and a full description of these mechanisms will therefore not now be necessary. The driving-shaft (l carries at its forward end a disk, G, having a cam-groove, g, for actuating the chain-stitch looper H. To render the chainstitch mechanism quickly and easily attachable to and removable from the machine, I provide the fixed bracket I with pins 1' 11 of sufficient length to project through holes in the bracket J, to which the looper H is pivoted. The projecting ends of the pins 13 13 are provided with small grooves or recesses adapted to receive the arms is of a latch, K, pivoted to the bracket J. As the pins 1; t are on opposite sides of the pivotal point of the latch K, their recesses are arranged to face in opposite directions, so that both of the arms of said latch, when the latter is turned on its pivot, may be simultaneously engaged with or disengaged from said pins. The latch K has a handle, by which it may be conveniently operated, and to prevent said latch from becoming accidentally misplaced a friction device,herein shown as a spring-washer, k is placed between the head of the pivotscrew 765 and the latch. A pin, h, formed integral with or secured to the looper H, engages the cam-groove g of the disk G, and as the latter rotates the said looper will receive a properlytimed vibratory motion.

The lock-stitch looper L is connected by a link, Z, to a detachable bracket, M, having grooved or recessed pins m. Said pins are of proper length to project through holes in the fixed bracket N, their recessed projecting ends being engaged by a latch, O, ofthe same form as the latch K, pivoted to the bracket N bya screw, 0, beneath the head of which is a frictionwasher, o', to assist in holding the latch 0 in any position to which it may be adjusted. When the bracket M is placed in position, it may be securely fastened by turning the arms of the latch 0 into the grooves or recesses of the pins m, and said bracket may be quickly rendered detachableby disengaging the arms of said latch from said pins, as will be readily understood.

Instead of using only two recessed pins for securing the removable brackets in position, a larger number of such pins, affording greater steadiness and security to the brackets, may be used by providing the securing-latches with a larger number of arms.

In Fig. 6 I have shown a latch, K having four arms, adapted to engage four recessed pins.

The crank-disk G is provided with a hole, 9 in which fits a pin, 2*,- on the looper L. Said pin Z is provided with an annular recess, 1, which is engaged by a spring-catch, 9 arranged in a recess in the periphery of the disk G. The end of the spring-catch 9 projects slightly beyond the periphery of the disk G, so that when'the lock-stitch mechanism is to be attached to or removed from the machinesaid spring-catch may be raised or moved outward by inserting the finger-nail of the operator beneath the projecting end thereof, thus allowing the pin 1 to be placed in or remove from its hole in the disk G.

The bobbin-supporter of the lock-stitch mechanism consists of two arms, 1) and p, the arm p being rigidly secured to or formed integral with the removable bracket M. The arm 1) is hinged to the arm 19, so that it may be swung outward, to permit of the insertion or removal of the bobbin-case It.

To hold the hinged arm pyieldingly against the bobbin-case, a light spring will be employedsuch, for example, as the spring 19', which, in the present instance, I have shown as being attached to the bracket M, so that it will be removed with said bracket, a recess in the fixed bracket N affording room for said spring.

As the lock-stitch looper and bobbin-supporter with their attached parts are all connected with the removable bracket M, it will be obvious that these devices may all be removed from the machine with said bracket. Thus from the foregoing it will be clear that the interchangeable devices, co operating with the needle in the formation of lock and chain stitches, may be quickly and easily attached to or removed from the machine without turning thumb-screws into or out of the fixed supporting-brackets, or screwing crankpins into or out of the disk on the drivingshaft, as in my former patent hereinbefore referred to.

In forming lock-stitches 'in the machine I described in .my former patent each stitch is tightened or completed by the drawing of the needle-thread inexpanding a loop thereof during the formation of the next succeeding stitch.

In order to shorten or tighten the loop 1 dropped by the lock-stitch looper L before the expansion of the next loop, and thus obviate any danger of drawing the needle-thread from the tension device instead of from the untight- I through the thread-guides tit, and thence to the needle. As the thread will thus be drawn across the vertical path ofthe projection f the latter, on its downward movement with the needle-bar, will engage the thread and draw up more or less of the last loop according to the position of the said projection on the needle-bar. On the upward movement of the needle-bar the projection will be disengaged from the thread, leaving the loop of slack thread which has been drawn up free to pass downward as theloop for the succeeding stitch is expanded by the looper.

Having now described my invention, I claim- 1. In a sewing-machine, the combination of a bed'platc, a fixed bracket, a removable bracket, a plurality of recessed pins, and a single pivoted latch adapted to engage said pins, and thereby secure the removable bracket to the fixed bracket, substantially as described.

2. In a sewing-machine, the combination of a bed-plate, a fixed bracket provided with recessed pins, a removable bracket having holes for-the passage of said pins, and a single pivoted latch adapted to engage said pins, and thus secure said brackets together, substantially as described.

3. In a sewingunachine, the combination of a bed-plate, a fixed bracket, a removable bracket, a plurality of recessed pins, a single pivoted latch adapted to engage said pins, and

a friction device for holding said latch in any position to which it may be adjusted, substantially as set forth.

. 4. In a sewing-machine, the combination of a bed-plate, a fixed bracket, a removable bracket, a plurality of recessed pins, 21 single pivoted latch adapted to engage said pins, and alooper carried by said removable bracket, substantially as described. 5. In a sewing-machine, the combination, with a bracket adapted to be removably secured to a bracket on the bed-plate thereof, of a bobbin-supporter and a looper, both carried by the removable bracket, and thus adapted to be simultaneously attached to or removed from the machine, substantially as described. 6. The combination, with a looper having a recessed pin fixed thereto, of a crank-disk having a hole in which said pin fits, and a spring-catch for removably securing said pin in said hole, substantially as described.

7 The combination, with a bracket adapted to be removably attached to the bed-plate of a sewing-machine, of a bobbin-supporter p, for holding said hinged arm in its opera- 10 consisting of two arms, one of said arms betive position, substantially as described. ing fixed with relation to said bracket, and In testimony whereof I affiX my signature in the other arm hinged to the fixed arm, subpresence of two witnesses. stantially as described. ,T

8. The combination of the bed-plate A, JOH) POST fixed bracket N, and removable bracket M, \Vitnesses: with the bobbinsupporter P, consisting of E. A. DICK, the fixed arm p, hinged arlnp, and the spring A. O. RAWLINGS. 

